/Engine/Source/Runtime/Landscape/Classes/LandscapeComponent.h
float GetLayerWeightAtLocation ( const FVector & InLocation, [ULandscapeLayerInfoObject](API\Runtime\Landscape\ULandscapeLayerInfoObject) * LayerInfo, [TArray](API\Runtime\Core\Containers\TArray)< uint8 > * LayerCache, bool bUseEditingWeightmap )